Poisson's ratio is the ratio of _____.

CONCEPT:

• Poisson's Ratio: The ratio of transverse contraction strain (or lateral strain) to longitudinal expansion strain.

\(Poisson’s\;ratio=-\frac{Transverse\;starin~(or~Lateral ~strain)}{Longitudinal\;strain}\)

EXPLANATION:

• From the definition of Poisson's ratio, it is the ratio of lateral strain to longitudinal strain.
• So the correct answer is option 3.

• The longitudinal strain is the change in length divided by the original length.

• Lateral strain or transverse strain: The change in the dimension perpendicular to the line of action of applied force

• Shear strain: The ratio of the change in deformation to its original length perpendicular to the axes of the body.